20020233251 has 4 divisors (see below), whose sum is σ = 20020883904. Its totient is φ = 20019582600.

The previous prime is 20020233239. The next prime is 20020233257. The reversal of 20020233251 is 15233202002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20020233251 - 2¹⁸ = 20019971107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020233257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276755 + ... + 341516.

It is an arithmetic number, because the mean of its divisors is an integer number (5005220976).

Almost surely, 2^20020233251 is an apocalyptic number.

20020233251 is a deficient number, since it is larger than the sum of its proper divisors (650653).

20020233251 is an equidigital number, since it uses as much as digits as its factorization.

20020233251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650652.

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 20020233251 its reverse (15233202002), we get a palindrome (35253435253).

The spelling of 20020233251 in words is "twenty billion, twenty million, two hundred thirty-three thousand, two hundred fifty-one".